Lua APA (7ú heag.)

Não informado. (1975). Rubber industry. Plastics and Rubber Institute.

Lua i Stíl Chicago (17ú heag.)

Não informado. Rubber Industry. London: Plastics and Rubber Institute, 1975.

Lua MLA (8ú heag.)

Não informado. Rubber Industry. Plastics and Rubber Institute, 1975.

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